Wednesday, July 17, 2019

general relativity - Time Travel possibility and Paradoxes of The Past



can one travel back in time and if not so, what laws prevent time travel to the past. this is quite a challenge to understand.




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

I am studying Statics and saw that: The moment of a force about a given axis (or Torque) is defined by the equation: $M_X = (\vec r \times \...